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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf0288ee5d0b645afc5fba33e7209c8c3d17c2f1e267aad24292fc0c89fe02e' 
  AND token = 'Uy/v8xQ5lyNhsUUNK4IovFVh/Po/EtDCj284UX/zTWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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