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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888490b87817b90761d273962496e900398e15de340fc93489d8f05cc72702da' 
  AND token = 'TA7m4G5EkJdZR7l5SUIz7dICmbXe0TQ2J/80no5v2is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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