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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30fa7fb29e7a06f5f058bc2d131f54af10cc2e1bb941df2830b365eb3b4a688' 
  AND token = 'szA0EcFtIycetOCn+6ublB7j05xtqP/ifSRpNysIPMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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