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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926b4373817441b0540c22ec4de7d9b0f33f93052700a51a83f33d99b1ccb9ba' 
  AND token = 'PEcDIYMGQKxNl1Thgv93k9ZlxvifKUdJ8zHx29nGSFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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