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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c8ffb568bdae640a5f92d7e89fb84fe8e3c253a355deb9a8f6ff226b21ad56' 
  AND token = '7q9HqJ6Da4r59Mn4gFRxqu2l+SjSucLIujDRhmT0+VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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