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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6066fbd002941a7a8ad613eabcef530524d2f476597b115f9b41c30176e4fb' 
  AND token = 'OUYelpM2cXfUi7ker1kul0ShxVxdlHHKpV+xwAmCljg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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