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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a2bfea007e336f953dc87a5b0ccc3ae5bbca6e1daaf34b33d1c35fb5596281' 
  AND token = 'FA8RmjGY1h1uIr5monPTZe1XVe6oCLbosZCojU5NhZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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