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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66e55ca6f752c29784e18a91b1ffcc39122c6381876dee22ed8424633e718e85' 
  AND token = 'AzbYmWQKba0UP8MlY4PlPQfLp7A8OomY9jTa6ISdigQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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