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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2855fa5edd63d7f197e3e1d8c689d26dec9c917a3c4536af9b97ea13b65675' 
  AND token = 'IquHWomyZfR7z6l81Ive/9gOHDp9ivTNW1FjjOcJx9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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