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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e882a5947e7e4b5ff564f90c220e9a8f5d9b2d479fb4976903dc0ff7672dac' 
  AND token = 'YMFCYPCPRx5UWjpP2Kn61yW/weVbJbD8JFp0iBrDTd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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