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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd891c5445d5e3161fe1e2eb2978d04e753b08dc81bedbae90c287e3497d1ce80' 
  AND token = 'nKz0wKvaxEI78uxOXuA63jf5e2iet3NDKgHGVe6kpJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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