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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47bd01493318ec9c2737ba44d63e892ce7b4522799566804b0b1c6943cd2ab1' 
  AND token = 'k8o5f7zAuGiUO08quKHAyrngJ+U0xTpwZ0l1b1sA3dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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