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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0394a0e6cb3ce4a54bbba1ec688ff7dda2aaa2b2f7a6355c1d62e57164306d6a' 
  AND token = 'doUoAaIoNT1/MNJg3UEU1rIsCFxaGgwdD0x2hrs7Jvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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