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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0cf82746461a05a48d6d43a78f4168cc0bf31534f87028c658e82cb08cffbe' 
  AND token = 'IhhVebWvy0r4pgsHM9q0IUQkNSFvQ4T07BrnNO8R/cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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