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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab8ae0f64cec86f3255f3ce61f9af7d86cdde4a843617c0ab4e6f12c3910ace' 
  AND token = 'HjYsu0Syqp8ltF61UJ3Z6G384TkACbWen4I3jnlLfNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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