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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dda86b3fa1b9b34a9774ed67c550f751af89b1fbaff1f357de8cde25e677f46' 
  AND token = 'sKQFeB6ZTHK2zUYX0dcKSrsKz86NxXqsrktZmxSWFRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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