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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a6da3e61296e032aced341066db85a9ae21c5ae2073ed779bd057ec7c9f65b' 
  AND token = 'IAEMQ3a9f38PWW1N2Whu4g9vSl8vYaWuLt4/Oa7QeCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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