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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ffeaff0cb0a8b25ccaeff46c356b089c3cf6e6d340e9224c43c83f2c8173f5' 
  AND token = '4830f0Kuf+lIbovGsp0ZXZrYI/HnYYlxjv4xg+xDa2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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