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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1947de6a659855976b4129f68c62a7c2dca9a3fc165ad3b4d2c2c4bc9f2da1' 
  AND token = '4P6TgHL4sIhXzWgjwTMSTfVy7ts8+IaxELbzvwg04yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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