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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc80437489dd58e967bece5b3a2219bf8ef5395e012f6b3e75e3bb468ef9713' 
  AND token = 'Ueo6SW5sgLwarOaEzjsT13DsU6IGIQ7l9o362t9OrCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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