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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bfa408a6054e09c8737e26e48fadfa216bfa6f5edb09fd8dc7adcd5c8b5eb3' 
  AND token = 'TwBr/l7fDjgs5jx1MtQZBvDSHXoTBaJSdxx4o28Pdqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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