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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7aff28c739a91c5a85aecddd04b4dfaae564601c694e0d911a521112909365' 
  AND token = 'ft2P1q0LZ14pWU09sL7Qxjz41d/5+vOpiFG5x08amaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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