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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076d6d47bae3ed90d0ec7e2fe9697a12b3b11cea52b8c92e0d7f82bf1c20bcee' 
  AND token = 'Xb/a/3jU3gJGAUVpw/myTkYw1X3co9G8JEOrRr5FCJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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