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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2b1f059a478c9e9b5a405e18eaed7e6eb1d0119cf053956cee44d955a248c2' 
  AND token = 'J+96f9ttmUueH+j4SA8eoTIa5c/5gIsnstasEcgu7Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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