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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94a4bce5deabc026e093eed2afa4b87bd2edcd52f4eafbe487e124df437cdaf' 
  AND token = 'b7fFQY07DLunoVi3PwM+WQJBH6RciOzqZzLgakYr4A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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