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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f922a48e69c928916cf614a3b965c4a544905edbb1fea7feb320f37e03301bb9' 
  AND token = 'OUHK1tQO99RH9cxz900ljzJmg9+djXROYNebVoyYqCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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