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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37dd658f187fcb7024d93a10c13d26777421db0ea9d3234591a498cd5264882e' 
  AND token = 'pBDEPOoDbr8kBZFznxgyr9p7CIEXq0juTcxcKLLo+TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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