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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1545e875ddf1830f0ea9a200033a3af0f0d1ef7913bdf4ae982ad1ee1013c1c' 
  AND token = 'MiuWNUko4wJD498CW5zJEKkcqOOguEHNUG2ekAI8CtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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