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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e6c06afc38d3c849b50d9f3cb6365adf5f982465c430a5c500cfacf2e51945' 
  AND token = 'CwcJWMtt2Xy/mzwBbjI3Ar82Asr8M27NHsUsSPOXFQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}