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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3d41b06fdbd004c381c83e9f0516d330c2f4e1207069806641b18f37929826' 
  AND token = 'DvJtSSKHG31/2YhTfdOb2x2qZ70WvcacgTwXv4utwws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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