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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba8dfaa5080f9897fd8c63e41ebf764845da2250e201d838147cf3736663327' 
  AND token = '4z29XJvUd5z4XC0tXiWPBULu1jLpSPNXcG4iam4Omow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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