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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e721d350e04c2910ff6b0ba9a55177cda5f479e60945ffe0321ab4bba16ad95c' 
  AND token = 'da4rBFLaSIq5K7Zdg53V0r9VLMsVnbmxs0NrMdw1Kcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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