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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bb819bd580f4ffa3d2364b9dcfa4b95d0a5dd8094c7e1b62b90e891c53bbb1' 
  AND token = 'lyn5kwIQ5aJ+2KPue7HbPdZi0SAQRDdHpeve4xGu7tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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