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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896f4a2d180dc6ed9b2e8c5787c65fe50b74af47e755a76d9f942df7c8ff9ec1' 
  AND token = 'XvS+MHx5PNCxXe5CJbD5JcPHZUjs59LqszsoAom22HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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