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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5355cd9c185999b4254b54c2b96c6c801b8b2b8fc1a95ba3b42c2658d89c6d' 
  AND token = 'NI+LTFadl9mPcbODGdjrhh9wMH3c0dDf0dDwSWp4uy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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