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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2573083e1631dbc54ff5c9c63f199668fe9c67531fffd3c73d153f99c894b744' 
  AND token = 'R2cJYvSfXZ/1wXHOAUw4tNX6e4LTC19gx9/TlgU43R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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