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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9092bd411f84f4628eca01f54f68c90c120e4b0af25eb9d64b45eb179cc54fb' 
  AND token = '5O2dh5kex3khbIOMnm9DJIKRKSBPAfye8zO2GUwQdOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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