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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4c92994a5d000fb230a9b6d229238a28b6254c563466676b0a5537d4276a05' 
  AND token = '9UMU99M785FR9PXLEyk3gjQaQTsduzu7SuSDqooEiJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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