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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35efe2015c20bcf888883fcc79fae3d387df564165e6c88473368d5cc7508658' 
  AND token = 'qOWGB5DZr4x60D1iGuuMMVVTFRccN3Zx5HbKgn571E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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