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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d9a8091ff5ecf1855b204c2ec89b8ca40eec14df5432f44285a2b0e676355b' 
  AND token = 'nfgMTAJKwBUJQ/pE688ksKm91JTqg6OhJlsPUfM5Wro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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