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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04bfebf359b8e4a833968c79338bb7c1db99a51edc46ea263d5107818dd4c55' 
  AND token = 'fQDTXsnqc7u1KsERy35qEgcAQYFK0BXT268mrO9F7PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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