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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14d031e3c047195c8e306ff29d804c36dc28b0de87a32c4c265fc160a9518fa' 
  AND token = 'cd+ihapGykSoNCQ80h+QggMQkPSG9iJ42dYIE2I7Qh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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