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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3d263fa6d120a47586360c41f139a139984df976397252ff762c20110d20d6' 
  AND token = 'wFC1A5IoXO0vSHTmGzB6FqNWtddkaOqoJiFO2BeAvmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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