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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31aafe9d2d78004b3b7014470d38257ac5336b9cf07006ac05db4e65333a915' 
  AND token = 'gnMj/i0Q3X0EVfk8riUxE/1BbwS+VUKLVg0O+c96+e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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