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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbfa208e2b39b84c0e21d90ba56428d7beb1337a1a42d15e61336d2213e3321a' 
  AND token = 'F2tFvdmLl7Ov5V2aQBK6N0PAS2Sxh2Wk+2qzFxN102U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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