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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c907871d6a764951933ac71c39622399b6191c9abadecb0579798de4a6705bc7' 
  AND token = 'XV7xEJzsVWuighcmy73ETil3e6+84Rt1ug4RiWLYasQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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