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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70dd193943b5791f31447af16cf486620449d007e80705554c8d64cf334fd46' 
  AND token = 'yB+W4wR7YokUOE66jPo911P3ICDMc4qTWAKfHFb5sJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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