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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6060491f863bb11fd3527d20686b79d3fdd4d566cdffc9f28e37e9e05ff6302d' 
  AND token = 'YwbxNbXqoZ719zIAAPpDboBRz1/Q7degYolXWkez30Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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