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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248850df35eeeb827d4a3793a7e21878cacffdba4e5cc74d6a52df1a13c4f316' 
  AND token = 'LvcGqAN7847LKbvkBuSO+II3j79Y93QeXZufQWbek7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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