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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b05a8af8cfa4c60c62b77375c591312df297f42dc4c3089192196a892fbe4a' 
  AND token = 'ktxXTIjQOA9y+jBVo8tI4M/id5QHVLideK2PwuDAK3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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