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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd1feb0690a567bc86d7c1aa1be127193b9328d4acc148e6ae48ab78e9adc6a' 
  AND token = 'AWXYCR29pVfbnyDYbP3hsQ0Fr7i65SJ9krsEcV9LCrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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