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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c372d0465f0927fd02849db7d54cfb020a8457642be3cf142f61878e44ee9069' 
  AND token = 'Fb/eTXi7i6tEC4ifmydgV3vQ87O0FhBQZBA+bU9x3E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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