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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08aba2f44fdbc3e19d473c9117556ba7b6287d91aae935ad41bc0c6d1b56c5c2' 
  AND token = 'JrEIhO6qS195PF4+1NkY5aholqMhBV76o4dCOGBb51g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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