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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6b8877addf0e607a37af5a5c2e967fb81f389ac437cd8a784d931ff6ed3a10' 
  AND token = '3USDlsh0AXdGVC/LvgL5M5d79HhaaYbAK8hIIeea2kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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