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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36edacf92fb1728c26e9f09ee0ee446433a1a5c28a8448e081bc0a33d08bd959' 
  AND token = '28adcvsOPlujMuwCfQcWj0GeQlIpvbp7Hf+ATcGFW2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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