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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e7ba8e880da65f31146f88da784ad056ed179ee3c73a9a17b48f18b30b7643' 
  AND token = '2L8TUfRXbo55ZCmc2i4bb1uiDcU5PzqUD7l4spKbH4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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