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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e16515f3f87d1be792a4b4cb38c7219b1d4eeb90942e900df494eb1451c120' 
  AND token = 'o4xCpIjXey+Rj43oq4Dzl7fXGuYe3R/dN+n43DdkN10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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