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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eda1f61b5b58cad77fd791fb9c4b7c3f8006db1de4105352dd0b9aecfc5024d' 
  AND token = 'KpEK60SMFDtc+hsfX3opuBSndp15JWamTzboTW3z4Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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