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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32aae0c2793b3ba430796a395accd4a109d9d52e42ec99569ea1a46361a22570' 
  AND token = 'U1okMFhE3m8PRgF4ZSEx2PrPbzqscI03pE5oyCeDk8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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